342 EXPERIMENT STATION RECOED. 



losses in Massachusetts, with suggestions for extinguishing and preventing for- 

 est fires. The texts of the Connecticut. ]Massachusetts. and Minnesota forest- 

 fire laws are given in the appendix. 



DISEASES OF PLANTS. 



Some fungus diseases of cultivated plants in France, G. Delacroix {Ex- 

 tract from Bui. »S'oc. Mycol. France, 21 (1905), No. S, pp. 1-23, figs. 6). — Brief 

 descriptions are given of the occurrence of Septoria cucurMtacearum on melon 

 leaves, Septoria on tomatoes, a disease of palms due to Exosporium palmi- 

 vortim, a disease of almonds due to Fiisicoccum ami/c/daU n. sp.. and a disease 

 of oleanders caused by Phoiiia oJcandriini n. sp. 



Some parasitic fungi of tropical cultivated plants, G. Delacroix (Extract 

 from Bui. Soc. Mycol. France, 21 {1905), No. 3, pp. 2Ji-37. fir/s. 10). — Among a 

 number of diseases of economic plants that are caused by attacks of parasitic 

 fungi, the author describes the following new species : CoUctotrichiim, theo- 

 iromicolum occurring on the fruit of cacao, C. hrachytrichum on the leaves of 

 cacao, Gloeosporium manmferw on mango leaves, a number of species of fungi 

 on rubber trees, Gkmicrella artocarpl on bread fruit, Diplodla perseana on 

 the avocado, and PhyUosticta cinnamomi on the leaves of cinnamon. 



Blight and powdery mildew of peas, J. M. Van Hook {Ohio ^ta. Bui. 

 113. pp. 231-2Ji9. fii/.s. 12). — After an introductory note by the botanist of the 

 station calling attention to the presence and injury due to these diseases on 

 a crop of peas grown for canning purposes, a description is given of the 

 different diseases and their causes, together with suggestions for their pre- 

 vention. 



The blighting of field and garden peas is due to the fungus Ascochyta pisi, 

 and from the author's investigation it was found that the infection spreads 

 largely through the use of diseased seed. Having determined this fact a 

 series of experiments was carried on to test the germination of peas affected 

 with the blight fungus and also the effect of seed treatment and the value of 

 spraying and tying up the vines as preventives. Seed treatment proved 

 valueless, as the fungus is less susceptible to fungicides than the germ of the 

 seed. For a similar reason heating the seed failed. Tying up the vines and 

 spraying, while increasing the crop slightly produced peas that were much 

 freer from disease than others and on that account are valuable in growing 

 healthy peas for seed purposes. 



Planting healthy peas in soil free from fungus is recommended as the best 

 means of reducing the loss of blight. The author states that the fungus 

 causing pea blight is known also to attack alfalfa, chick-peas, common beans, 

 and hairy vetch. All varieties of the common bean examined were affected, 

 but some much more than others. 



In the note on the powdery mildew (Erysiphc communis), the author states 

 that by spraying with Bordeaux mixture the disease may be readily pi'evented. 



Anthracnose of beans and peas, H. Bi.in {Rev. Hort. [Paris], 78 {1906), 

 No. l.'i, pp. 335-337). — Descriptions are given of the anthracnose or beans due to 

 Colletotrichum lindemuthianum and of peas caused by Ascochyta pisi, with 

 suggestions for their prevention. In experiments carried on in 1901 and 1903 

 in which beans were tlioroughly sprayed with Bordeaux mixture, relatively 

 little disease was observed, and the author thinks that ;i similar treatment 

 would be efficient in preventing the anthracnose of peas. 



A disease of ginseng due to Phytophthora, .7. ;\I. Van Hook {^^prc. Crops, 

 II. srr.. 5 (1906). No. '/■), p. D'/). — Tlie author describes a disease of ginseng 

 which is due to Phytophthora omnivora. The fungus is very common on many 



